Improvement in door-locks



l J. BRADY. Improvement in Door-Locks.

Patented Sep. 24, 1872.

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JAMESBRADY, or BROOKLYN, NEW YORK.

IMPRVEMNT IN DGQR-LCCKS.

that the following is a full, clear, and exact description of the same,reference being had V to the accompanyingdrawing forming part of thisspecification, and in which- Figure 1 represents an interior view of thelock as seen from its one side, showing the tumblers as dropped and boltthrown back;

Fig. 2, a transverse section of the same atthe line w w; Fig. 3 atransverse section at the line as w; Fig. 4 is a similar view to Fig. 1,but showing the tumblers as raised and bolt shot forward; Fig. 5 is atransverse section of the same at the line y y; and Fig. 6 a translverse section at the line z z.

Similar letters of reference indicate corresponding parts.

t This invention relates to locks suitable, among other purposes oruses, to hotel and state rooms, and in which it is required to providefor the locking and unlocking of the door by means of either one of twokeys, the

one of which is a master-key that Will'lock and unlock any desirednumber of doors or apartments fitted with similar locks, while the otheror regular key fits or operates a particular lock, thus requiring aseparate or regular key for each of the several locks controlled by themaster-key.` The invention consists in a combination, with the regulartumblers which the particular or regular key controls, oftumbler-carriers or distinct secondary tumblers controlled by the masteror general key, and operatin g, when raised, to lift the regulartumblers, all of such secondary tumblers being alike throughout theseveral locks having the same master-key, while the regular tumblers.ofeach lock are different. The invention is applicable to any style oftumblers having the key applied to lift them, nor is the numberoftumblers restricted. Y

Referring to the accompanying drawing, A represents the lock-case, and Bthe bolt. C is the key-hole on the outside of the lock or door for boththe master-key D and regular key E.

When the tumblers are lifted either key acts to shoot or draw back thebolt, as in other locks, and the stump c on the bolt, passingprojections d from the regular tumblers, occupies positions on oppositesides of said projections to hold the bolt shot or drawn back, as usual.The surfaces or edges e of the regular tumblers F are cut or shapedexclusively for the regular key E to it them, and such key actsaltogether independently of the secondary tumblers or tumbler-carriersG, although to a certain extent` the latter may move in common with theregular tumblers; but the locking or unlocking of the bolt is effectedby the regular key through or by means of the regular tumbler. Thesurfaces or edges f of the secondary tumblers or tumbler carriers G,against or on which the master-key D acts, are differently out, shaped,or arranged, and, when lifted by the master-key, carry the regulartumblers F up with them by means of lips g on the secondary tumblerscatching under the regular tumblers, or otherwise freely andequivalently connecting the two kinds or sets of independent tumblers.It is not necessary however, that the secondary tumblers Gr should havethe stop projection d, with which the regular tumblers F are provided,and both sets of tumblers may be readily cut or stamped of the requiredshape, and be madelight or of reduced thickness. H is a key hole in theface of 'the lock, which lies on the inside of the door. This key-holecommunicates with a hollow turning-cam, I, which is held in positionopposite the key-hole by a spring, h, to receive either the master-keyor regular key of the lock, or any other key that will enter within saidcam, and to admit of such keys Withdrawal when needed. This hollow cam,as it is turned by the key, acts upon the tumblers and bolt to shoot ordraw back the latter, accordingly as it is required to lock or unlockthe door from the inside. Its uses and advantages have already beenmentioned in the preamble of this speciication.

What is here claimed, and desired to be secured by Letters Patent, is-

The combination of one or more independent tumbler-carriers, G, with oneor more regular tumblers, F, of the lock, for independent operation bytwo keys to shoot or draw back the bolt, substantially as specified.

JAMES BRADY.

Witnesses:

FRED. HAYNES, FERD TUscH.

